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ScalarUDFImpl invoke improvements #13507

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alamb
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@alamb alamb commented Nov 20, 2024

Builds on #13290 from @joseph-isaacs

Which issue does this PR close?

Rationale for this change

If we are going to change the signature of invoke I would to make it possible in the future to reuse allocations -- at the moment the API requires creating new arrays even when the input array is not used because the functions get the input as &[ColumnarValues] meaning they don't own them (the caller retains a reference)

What changes are included in this PR?

Change ScalarFunctionArgs to pass by value

1,

Are these changes tested?

Are there any user-facing changes?

@github-actions github-actions bot added logical-expr Logical plan and expressions physical-expr Physical Expressions functions labels Nov 20, 2024
// evaluate the function
let output = self.fun.invoke_batch(&inputs, batch.num_rows())?;
let output = self.fun.invoke_with_args(ScalarFunctionArgs {
args: inputs,
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the whole point of this PR is to pass in inputs here rather than inputs.as_ref

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Eventually we should probably consider doing the same thing for evaluate 🤔

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findepi commented Nov 23, 2024

Can we have one example function doing that, with some tests proving this indeed works?

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Perf: Allow User defined functions to potentially reuse their argument arrays (to avoid new allocations)
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